28808657386 has 8 divisors (see below), whose sum is σ = 43215418980. Its totient is φ = 14403517728.

The previous prime is 28808657341. The next prime is 28808657389. The reversal of 28808657386 is 68375680882.

It can be written as a sum of positive squares in 2 ways, for example, as 28791641761 + 17015625 = 169681^2 + 4125^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28808657389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360061 + ... + 432736.

Almost surely, 2^28808657386 is an apocalyptic number.

28808657386 is a deficient number, since it is larger than the sum of its proper divisors (14406761594).

28808657386 is a wasteful number, since it uses less digits than its factorization.

28808657386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810968.

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 28808657386 in words is "twenty-eight billion, eight hundred eight million, six hundred fifty-seven thousand, three hundred eighty-six".